Shoemaker 845-14X4 14"x4" Stamped 3-Way Diffuser - White 845 O - Steel Lever Operated Opposed Blade Damper 845 O Steel Lever Action Opposed Blade Damper All Component Parts, Rivets, Linkage, And Handle, Are Enclosed In The Valve To Assure Trouble Free Operation All Component Parts, Rivets, Linkage, And Handle, Are Enclosed In The Valve To Assure Easy Operation